From: Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>
Signed-off-by: Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>
---
drivers/input/touchscreen/wacom_i2c.c | 216 ++++++++++++++++++++++++++++
drivers/input/touchscreen/wacom_i2c.h | 66 +++++++++
drivers/input/touchscreen/wacom_i2c_func.c | 81 +++++++++++
drivers/input/touchscreen/wacom_i2c_func.h | 8 +
4 files changed, 371 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/touchscreen/wacom_i2c.c
create mode 100644 drivers/input/touchscreen/wacom_i2c.h
create mode 100644 drivers/input/touchscreen/wacom_i2c_func.c
create mode 100644 drivers/input/touchscreen/wacom_i2c_func.h
diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
new file mode 100644
index 0000000..4f5910a
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c.c
@@ -0,0 +1,216 @@
+/*
+ * Wacom Penabled Driver for I2C
+ *
+ * Copyright (c) 2011 Tatsunosuke Tobita, Wacom.
+ * <tobita.tatsunosuke@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software
+ * Foundation; either version of 2 of the License,
+ * or (at your option) any later version.
+ *
+ * Note: Wacom Penabled Driver for I2C obtains data by polling.
+ * If you use irq, you must use the edge based rising
+ * interruption with low level pin.
+ */
+
+#include <linux/device.h>
+#include "wacom_i2c_func.h"
+
+const unsigned short addr[2];
+
+static void wacom_i2c_workqueue(struct work_struct *workq)
+{
+ struct wacom_i2c *wac_i2c = container_of(workq, struct wacom_i2c, workq);
+ wacom_set_coordination(wac_i2c);
+}
+
+static enum hrtimer_restart wacom_i2c_timer(struct hrtimer *timer)
+{
+ struct wacom_i2c *wac_i2c = container_of(timer, struct wacom_i2c, timer);
+
+ queue_work(wacom_i2c_wq, &wac_i2c->workq);
+ hrtimer_start(&wac_i2c->timer, ktime_set(0, POLL_RATE), HRTIMER_MODE_REL);
+
+ return HRTIMER_NORESTART;
+}
+
+static int wacom_i2c_input_open(struct input_dev *dev)
+{
+ struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
+
+ mutex_lock(&wac_i2c->lock);
+ wac_i2c->dev->open = true;
+ mutex_unlock(&wac_i2c->lock);
+
+ return 0;
+}
+
+static void wacom_i2c_input_close(struct input_dev *dev)
+{
+ struct wacom_i2c *wac_i2c = input_get_drvdata(dev);
+
+ mutex_lock(&wac_i2c->lock);
+ wac_i2c->dev->open = false;
+ mutex_unlock(&wac_i2c->lock);
+}
+
+static void wacom_i2c_set_input_values(struct i2c_client *client,
+ struct wacom_i2c *wac_i2c, struct input_dev *dev)
+{
+ dev->name = "WACOM_I2C_DIGITIZER";
+ dev->id.bustype = BUS_I2C;
+ dev->id.vendor = 0x56a;
+ dev->dev.parent = &client->dev;
+ dev->open = wacom_i2c_input_open;
+ dev->close = wacom_i2c_input_close;
+ dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+
+ __set_bit(ABS_X, dev->absbit);
+ __set_bit(ABS_Y, dev->absbit);
+ __set_bit(ABS_PRESSURE, dev->absbit);
+ __set_bit(BTN_TOOL_PEN, dev->keybit);
+ __set_bit(BTN_TOOL_RUBBER, dev->keybit);
+ __set_bit(BTN_STYLUS, dev->keybit);
+ __set_bit(BTN_STYLUS2, dev->keybit);
+ __set_bit(BTN_TOUCH, dev->keybit);
+}
+
+static int wacom_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wacom_i2c *wac_i2c;
+ int i, ret;
+ i = ret = 0;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ goto err2;
+
+ wac_i2c = kzalloc(sizeof(struct wacom_i2c), GFP_KERNEL);
+ wac_i2c->wac_feature = &wacom_feature_EMR;
+
+ mutex_init(&wac_i2c->lock);
+
+ wac_i2c->dev = input_allocate_device();
+ if (wac_i2c == NULL || wac_i2c->dev == NULL)
+ goto fail;
+ wacom_i2c_set_input_values(client, wac_i2c, wac_i2c->dev);
+
+ wac_i2c->client = client;
+
+ INIT_WORK(&wac_i2c->workq, wacom_i2c_workqueue);
+
+ ret = wacom_send_query(wac_i2c);
+ if (ret < 0)
+ goto err1;
+
+ wac_i2c->dev->id.version = wac_i2c->wac_feature->fw_version;
+ input_set_abs_params(wac_i2c->dev, ABS_X, 0,
+ wac_i2c->wac_feature->x_max, 0, 0);
+ input_set_abs_params(wac_i2c->dev, ABS_Y, 0,
+ wac_i2c->wac_feature->y_max, 0, 0);
+ input_set_abs_params(wac_i2c->dev, ABS_PRESSURE, 0,
+ wac_i2c->wac_feature->pressure_max, 0, 0);
+ input_set_drvdata(wac_i2c->dev, wac_i2c);
+
+ i2c_set_clientdata(client, wac_i2c);
+ if (input_register_device(wac_i2c->dev))
+ goto err1;
+
+ hrtimer_init(&wac_i2c->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ wac_i2c->timer.function = wacom_i2c_timer;
+ hrtimer_start(&wac_i2c->timer, ktime_set(1, 0), HRTIMER_MODE_REL);
+ printk(KERN_INFO "WACOM_I2C_DIGITIZER: initialized and started \n");
+
+ return 0;
+
+ err2:
+ printk(KERN_ERR "wacom_i2c:No I2C functionality found\n");
+ return -ENODEV;
+
+ err1:
+ printk(KERN_ERR "wacom_i2c:err1 occured(num:%d)\n", ret);
+ input_free_device(wac_i2c->dev);
+ wac_i2c->dev = NULL;
+ return -EIO;
+
+ fail:
+ printk(KERN_ERR "wacom_i2c:fail occured\n");
+ return -ENOMEM;
+}
+
+static int wacom_i2c_remove(struct i2c_client *client)
+{
+ struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
+
+ input_unregister_device(wac_i2c->dev);
+ hrtimer_cancel(&wac_i2c->timer);
+ kfree(wac_i2c);
+
+ return 0;
+}
+
+static int wacom_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ int ret;
+ struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
+
+ hrtimer_cancel(&wac_i2c->timer);
+ cancel_work_sync(&wac_i2c->workq);
+ ret = wac_i2c->power(0);
+
+ return 0;
+}
+
+static int wacom_i2c_resume(struct i2c_client *client)
+{
+ struct wacom_i2c *wac_i2c = i2c_get_clientdata(client);
+
+ hrtimer_start(&wac_i2c->timer, ktime_set(1, 0), HRTIMER_MODE_REL);
+
+ return 0;
+}
+
+static const struct i2c_device_id wacom_i2c_id[] = {
+ {WACNAME, 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
+
+static struct i2c_driver wacom_i2c_driver = {
+ .driver = {
+ .name = "wacom_i2c",
+ },
+
+ .probe = wacom_i2c_probe,
+ .remove = wacom_i2c_remove,
+ .suspend = wacom_i2c_suspend,
+ .resume = wacom_i2c_resume,
+ .id_table = wacom_i2c_id,
+};
+
+static int __init wacom_i2c_init()
+{
+
+ wacom_i2c_wq = create_singlethread_workqueue("wacom_i2c_wq");
+ if (!wacom_i2c_wq)
+ return -ENOMEM;
+
+ return i2c_add_driver(&wacom_i2c_driver);
+}
+
+static void __exit wacom_i2c_exit()
+{
+ if (wacom_i2c_wq)
+ destroy_workqueue(wacom_i2c_wq);
+
+ i2c_del_driver(&wacom_i2c_driver);
+}
+
+module_init(wacom_i2c_init);
+module_exit(wacom_i2c_exit);
+
+MODULE_AUTHOR("Tatsunosuke Tobita <tobita.tatsunosuke@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("WACOM EMR I2C Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/wacom_i2c.h b/drivers/input/touchscreen/wacom_i2c.h
new file mode 100644
index 0000000..4c5f79f
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c.h
@@ -0,0 +1,66 @@
+#ifndef WACOM_I2C_H
+#define WAOCM_I2C_H
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/hrtimer.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#define NAMEBUF 12
+#define WACNAME "WAC_I2C_EMR"
+
+/*Wacom Command*/
+#define COM_COORD_NUM 256
+#define COM_SAMPLERATE_40 0x33
+#define COM_SAMPLERATE_80 0x32
+#define COM_SAMPLERATE_133 0x31
+#define CMD_QUERY0 0x04
+#define CMD_QUERY1 0x00
+#define CMD_QUERY2 0x33
+#define CMD_QUERY3 0x02
+#define CMD_THROW0 0x05
+#define CMD_THROW1 0x00
+#define QUERY_SIZE 19
+
+/*I2C address for digitizer*/
+#define WACOM_I2C_ADDR 0x09
+
+/*Polling Rate*/
+#define POLL_RATE 7500000
+
+static struct workqueue_struct *wacom_i2c_wq;
+
+/*Parameters for wacom own features*/
+struct wacom_features {
+ int x_max;
+ int y_max;
+ int pressure_max;
+ char fw_version;
+ u8 data[COM_COORD_NUM];
+};
+
+static struct wacom_features wacom_feature_EMR = {
+ 16128,
+ 8448,
+ 256,
+ 0x10
+};
+
+/*Parameters for i2c driver*/
+struct wacom_i2c {
+ struct i2c_client *client;
+ struct input_dev *dev;
+ struct mutex lock;
+ struct work_struct workq;
+ struct hrtimer timer;
+ struct wacom_features *wac_feature;
+ int (*power)(int on);
+ const char name[NAMEBUF];
+};
+#endif
diff --git a/drivers/input/touchscreen/wacom_i2c_func.c b/drivers/input/touchscreen/wacom_i2c_func.c
new file mode 100644
index 0000000..51e6f4f
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c_func.c
@@ -0,0 +1,81 @@
+#include "wacom_i2c_func.h"
+
+int wacom_send_query(struct wacom_i2c *wac_i2c)
+{
+ struct wacom_features *wac_feature = wac_i2c->wac_feature;
+ int ret;
+ u8 cmd[4] = {CMD_QUERY0, CMD_QUERY1, CMD_QUERY2, CMD_QUERY3};
+ u8 data[COM_COORD_NUM];
+
+ ret = i2c_master_send(wac_i2c->client, cmd, sizeof(cmd));
+ if (ret < 0) {
+ printk(KERN_ERR "wacom_i2c: Sending Query failed \n");
+ return -1;
+ }
+
+ cmd[0] = CMD_THROW0; cmd[1] = CMD_THROW1;
+ ret = i2c_master_send(wac_i2c->client, cmd, 2);
+ if (ret < 0) {
+ printk(KERN_ERR "wacom_i2c: Sending Query failed \n");
+ return -1;
+ }
+
+ ret = i2c_master_recv(wac_i2c->client, data, QUERY_SIZE);
+ if (ret < 0) {
+ printk(KERN_ERR "wacom_i2c: Receiving Query failed\n");
+ return -1;
+ }
+
+ wac_feature->x_max = get_unaligned_le16(&data[3]);
+ wac_feature->y_max = get_unaligned_le16(&data[5]);
+ wac_feature->pressure_max = get_unaligned_le16(&data[11]);
+ wac_feature->fw_version = get_unaligned_le16(&data[13]);
+
+ printk(KERN_INFO "wacom_i2c: x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
+ wac_feature->x_max, wac_feature->y_max, wac_feature->pressure_max,
+ wac_feature->fw_version);
+
+ return 0;
+}
+
+int wacom_set_coordination(struct wacom_i2c *wac_i2c)
+{
+ int ret = 0;
+ unsigned int x_max, y_max;
+ unsigned int x, y, pressure;
+ unsigned char rdy, tsw, f1, f2, ers;
+ u8 *data;
+
+ data = wac_i2c->wac_feature->data;
+ x_max = wac_i2c->wac_feature->x_max;
+ y_max = wac_i2c->wac_feature->y_max;
+
+ ret = i2c_master_recv(wac_i2c->client, data, QUERY_SIZE);
+ if (ret >= 0) {
+ tsw = data[3]&0x01;
+ ers = data[3]&0x04;
+ f1 = data[3]&0x02;
+ f2 = data[3]&0x10;
+ rdy = data[3]&0x20;
+
+ x = le16_to_cpup((__le16 *)&data[4]);
+ y = le16_to_cpup((__le16 *)&data[6]);
+ pressure = le16_to_cpup((__le16 *)&data[8]);
+
+ input_report_abs(wac_i2c->dev, ABS_X, x);
+ input_report_abs(wac_i2c->dev, ABS_Y, y);
+ input_report_abs(wac_i2c->dev, ABS_PRESSURE, pressure);
+ input_report_key(wac_i2c->dev, BTN_TOOL_PEN, tsw);
+ input_report_key(wac_i2c->dev, BTN_STYLUS, f1);
+ input_report_key(wac_i2c->dev, BTN_STYLUS2, f2);
+ input_report_key(wac_i2c->dev, BTN_TOOL_RUBBER, ers);
+ input_report_key(wac_i2c->dev, BTN_TOUCH, (tsw || ers));
+
+ input_sync(wac_i2c->dev);
+
+ } else {
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/drivers/input/touchscreen/wacom_i2c_func.h b/drivers/input/touchscreen/wacom_i2c_func.h
new file mode 100644
index 0000000..cce35c4
--- /dev/null
+++ b/drivers/input/touchscreen/wacom_i2c_func.h
@@ -0,0 +1,8 @@
+#ifndef WACOM_I2C_FUNC_H
+#define WACOM_I2C_FUNC_H
+
+#include "wacom_i2c.h"
+
+int wacom_set_coordination(struct wacom_i2c *wac_i2c);
+int wacom_send_query(struct wacom_i2c *wac_i2c);
+#endif
--
1.7.1
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